/Engine/Source/Runtime/Engine/Public/SaveGameSystem.h
Saves the named savegame asyncronously. Default implementation runs blocking version on a background thread
virtual void SaveGameAsync ( bool bAttemptToUseUI, const TCHAR * Name, [FPlatformUserId](API\Runtime\Core\Misc\FPlatformUserId) PlatformUserId, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< const [TArray](API\Runtime\Core\Containers\TArray)< uint8 >> Data, [FSaveGameAsyncOpCompleteCallback](API\Runtime\Engine\ISaveGameSystem\FSaveGameAsyncOpCompleteCallback) Callback )